Meade Instruments Corporation
Telescopes · Binoculars · Microscopes

Meade® Series 4000 Eyepieces

High-resolution optics that realize the full potential of the zoom format.

For years zoom eyepieces were regarded as "convenient," but without the optical resolution required in demanding astronomical applications. The Meade Series 4000 Zoom Eyepiece has changed that impression — completely and forever.

Meade® Series 4000 Eyepieces

Because, finally, this is a zoom eyepiece designed for the advanced amateur astronomer who is uncompromising in his or her optical performance specifications. Performance is fully consistent with the finest fixed focal length eyepieces.

The Meade Series 4000 Zoom is an excellent addition to telescopes of all types, brands, and price levels, whether 60mm refractor, 8" Dobsonian, 90mm ETX, or 12" LX200 Schmidt–Cassegrain. Conceived by one of the world's leading designersof photo–optical instruments, this 7–element system provides an apparent field of 40° at the 24mm setting, increasing continuously to a 55° field at 8mm. The internal zoom optics move on smooth, precisely machined surfaces which maintain optical collimation at all zoom settings. A scale graduated in 1mm units indicates the zoom focal length in operation. All lenses are multi–coated for maximum light transmission and image contrast, while minimizing internal reflections. The chromed brass barrel is threaded for filters. 

Meade® Series 4000 Eyepieces
Section drawing of the Meade Zoom Eyepiece, showing layout of 7-elements.
With its high-eyepoint optics and foldable rubber eyecup the Meade Series 4000 Zoom Eyepiece is comfortably usable by eyeglass wearers; even with eyeglasses the entire field of view is easily observable. 

Meade® Series 4000 2x Apochromatic Barlow Lens (1.25")

Exclusive Meade 3-element, air-spaced design; thousands now in use worldwide.

#140 2x Apochromatic Barlow Lens: The most advanced Barlow lens yet developed for commercial telescopes, the Meade #140 2x Apochromatic Barlow includes a 3-element, air-spaced telenegative lens unmatched in image resolution, contrast, and color correction.

The #140 2x Apochromatic Barlow Lens multiplies eyepiece powers by a factor of two, while maintaining excellent image corrections.
Meade® Series 4000 2x Apochromatic Barlow Lens (1.25")

Used with any telescope — refractor, reflector, or Schmidt-Cassegrain — equipped with a focuser accepting standard 1.25" barrel-diameter eyepieces, the #140 Barlow doubles the telescope's effective focal length, thereby doubling the effective eyepiece magnification. With a diagonal mirror or prism placed between the Barlow and an eyepiece (e.g., in applications with refractors or Schmidt-Cassegrains), effective eyepiece magnification is approximately tripled. 

Meade® Series 4000 2x Apochromatic Barlow Lens (1.25")

The #140 optically complements Meade Series 4000 eyepieces, while enhancing the performance of other eyepieces as well. Mechanical components are of machined aluminum and brass. Lens diameter is 28mm; clear aperture is 26mm. 

The multi-coated optics of the #140 Barlow provide maximum light transmission and image contrast. Thousands of these Meade Barlow systems are now in use by advanced amateurs worldwide. There is no finer Barlow available. 


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